Hi, I'm running oVirt 4.4 and recently I changed the Data Center compatibility version from 4.3 to 4.4. Now turns out that some Pools are unable to restart machines, returning this error: Cannot run VM. The Custom Compatibility Version of VM ... (4.3) is not supported in Data Center compatibility version 4.4. I cannot edit manually the custom compatibility version of VMs, as pools won't allow that. Is there any manual way to fix it? I tried to do it via Python SDK but it doesn't seem to work... vm = vms_serv.list(name='X')[0] ver = vm.custom_compatibility_version ver.minor = 4 vm.custom_compatibility_version = ver vmsv = sys_serv.vms_service().vm_service(id=vm.id) vmsv.upfate(vm=vm) It doesn't seem to do any difference, though. Any help is really appreciated, as many our users can't use theis VMs. Thanks.